This Part Fits the following kits / parts:

#88020 - ピニオンギヤ 20T (0.6M)

E10/48, 64ピッチのスパーギアには使用できません。

Optional tuning gear for the E10. A lower tooth count on the pinion
gear will give you more acceleration, while a higher tooth count
will give you extra top speed. Have a selection of pinion gears
available so you can tune the speed of your car as desired!